I am hoping this will show up on Google for people who like me had this problem as I have a solution.

I was very excited to get my Color Munki Photo [Used]. Now I can calibrate my old photo printer and use different papers and even ink suppliers as the B 9180 is obsolete but works for my needs.

My old dying Dell 2007 WFP calibrated perfectly just dark. This is amazing considering the dying backlight gives it a hard yellow cast without calibration.

My newer Dell U2412m. Had a strong green cast to the final calibration it was driving me crazy.

This is how I solved it:

Even though it is an LED monitor give it 15-30 minutes warm up time. before ANY calibration.

Do a factory reset of the monitor, especially if you have been working with some other tools. This monitor has some level of ADC and when I used the free calibration software Display3 it made some internal color adjustments that messed things up pretty bad. So I did a full reset.

Access the factory menu and turn off Over Drive and Dynamic Contrast. You access this menu by holding the top two buttons on the U2412M while turning it on. Then once on press any menu button. After you are done, you can turn overdrive back on for games and video if you needed that. It won’t affect the color, I just was concerned it was affecting the stability of the readings by the spectrometer.

Do your normal calibration to get Contrast and Brightness right on the Monitor settings and ignore that profile it creates until you do the next step for color fidelity. You will not set these in the next calibration.

Why this solution?

I noticed the that new Color Munki Display / i One Display Pro have a large lens on the sensor end vs a tiny hole. The Color Munki Photo has a tiny hole. It is my guess that there are two things affecting the color calibration on some DELL monitors.

The anti-glare coating I believe light pipes the ambient light into the top glass in some way because I get better calibrations when the room is dark at night than I do in the day. Light leaks into the target region is my assumption.

But it also occurred to me that on such a small target area that visual color was not being seen vs some of the variations at the pixel level.

So after you have the Contrast Setting and Brightness set, follow these steps to get a better calibrated monitor.

Wait until you can get the room very dark, especially near the monitor. We want to have zero light hitting the monitor surface.

Tell the Color Munki software you are calibrating a projector. This is how we give the Color Munki Photo the ability to sample a larger area of the monitor like the new display only devices from X-rite.

Set the device on box so it is facing the front of the monitor about 6 inches away.

Follow the instructions for D65 color temperature.

That’s it. We remove the light leaks and reflections and we let the small sensor judge the color with a larger area of the monitor surface. Once I did that I have a profile that looks near perfect to me. If you need it better use the Color Munki Photo/Design for color sampling and print profiles and get a dedicated display device like the i One Display Pro or Color Munki Display for your Monitor.